Asked by Kaur
                If 12 is added to each term of the AP : -12,-9,-6,...,21 then 
which of the following is true about the sum of all terms of the AP thus obtained ?
A) The sum will increase by 12
B) The sum will increase by 144
C) The sum will become 12 times
D) The sum will become 144 times
            
        which of the following is true about the sum of all terms of the AP thus obtained ?
A) The sum will increase by 12
B) The sum will increase by 144
C) The sum will become 12 times
D) The sum will become 144 times
Answers
                    Answered by
            oobleck
            
    There are (21+12)/3 + 1 = 12 terms
so the sum will increase by 12*12 = 144
    
so the sum will increase by 12*12 = 144
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